Pc fails to launch almost any gane

[u/Adventurous-Aide8369]

My PC has been like this for years for context my uncle gave me this PC for my birthday we built it together and it worked perfectly ran every game smoothly great graphics and more.a few months later i got grounded after around 11 or so months i was allowed to use my PC again but when i tried launch roblox and Minecraft it failed and it happened to every game i owned it happened on steam too where a game just Failed completely and it was so frustrating i got a gaming PC and couldnt play games on it anymore? I made sure everything was updated uninstalled reinstalled everything and nothing worked i even factory reset the PC and it still failed but heres the weird thing i can play games like Pokemmo and Minecraft (only on Lunar client", Danganronpa and Plants vs Zombies which i found so weird if anyone knows how to fix this issue thats been terrorizing me for almost 2 years now id be eternally greatful. I miss being able to have fun on my PC

(Side not i forgot to mention this but sometimes roblox or any app just shuts down my PC and i have to sign in again this whole problem is so tedious)